I also have ran across that problem in trying to mount a squash file from another version of puppy.
If it is indeed a matter of the sub-type of squash file compression, it would be in puppy's interests to get a standard for compatibility in all squash version 4 files.

The main problem for portable apps. is the kernel only mounts one type.
Even if several types can be mounted, most distro`s. kernels won`t.
So the only solution is to pick the newest Squash compression type,
or make the portable apps. "loose files" ( not a good alternative ).

# Linux being what it is, "one app. fits all" just isn`t possible it seems.

Bruce B; Yes, that`s what I found, there`s 2 compressions for version 4.

This ambiguity makes for my current dilemma, to use XZ compression
would be the best as it`s the newest and most capable.
But Puppy and Tiny Core use LZMA ( I think...), probably for faster access.
This may be changed with time and newer versions of the O.S.s.

# Squash files don`t lend themselves to portability between kernels.
If the compression type was something that could be add on-the-fly...

Could it bee that one version of Puppy was built with woof and the other was built using T2 which Barry still uses sometimes.
If it is in the type of utility used to build a SFS file differing depending on the builder of a Puppy version, I would like to see the developers get on the same track and use the same version/type of SFS builder thus maintaining SFS4 compatibility across versions of Puppy.

Different linux kernel version numbers are compatible with different types of squash compression. For example, a debian wheezy squashfs file cant be mounted by a debian squeeze squashfs file as the wheezy kernel supports a newer type of compression.

there is confusion between cpio, zip, gzip, lzma and other types. One lzma isnt the same as another lzma as there are very many different types and versions of it.

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